Geosynthetics February/March 2020 - 16

An innovative erosion control solution using concrete enhanced synthetic turf

accordance with ASTM G147, Standard
Practice for Conditioning and Handling
of Nonmetallic Materials for Natural and
Artificial Weathering Tests, and ASTM
G7, Standard Practice for Atmospheric
Environmental Exposure Testing of
Nonmetallic Materials. Testing of turf
fibers under ultraviolet exposure was
completed at Atlas Material Laboratories
in New River, Ariz. Exposure to natural
UV light was accomplished by affixing
turf fibers to a static, south-facing panel
tilted to maximize irradiance exposure.
The turf samples were exposed for a given
exposure period (1.3, 5, 7 and 10 years),
and retained tensile strength was then
measured. Retained tensile strength was
plotted against exposure duration, as
shown in Figure 3.
A logarithmic line was fit to the data
points and extrapolated out to 100 years.
At 50 years, the retained tensile strength
of the synthetic turf yarn is projected to
be approximately 70%. At 70% retained
tensile strength, the CEST will continue
to function as designed and provide
reinforcement for the infill, protection of
the geotextile backing layers and protection of the underlying geomembrane. With
proper maintenance, a 50+ year resistance
to weathering is realistic for CEST.

FIGURE 2 Wave overtop testing of CEST

Engineered turf
weathering resistance
The engineered synthetic turf layer with
the cementitious infill is the protection
layer of the CEST system. These components shield the underlying backing
geotextiles and geomembrane. The yarns
of the synthetic turf are the only synthetic component of the system directly
exposed to the elements, specifically
ultraviolet (UV) light. Weathering tests
of these yarns have been performed in
16

Geosynthetics | February March 2020

Flammability
The CEST system was tested for surface flammability in accordance with
ASTM D2859, Standard Test Method
for Ignition Characteristics of Finished
Textile Floor Covering Materials. This is
the standard test method that is required
by the U.S. Consumer Product Safety
Commission for Carpets and Rugs.
A CEST sample was placed inside an
8-inch (20.3-cm) diameter metal frame.
An ignition source (methenamine solid
fuel tablet) was placed in the middle of
the sample. The methenamine tablet was
then lit and burned at 700˚F (370˚C) for
approximately two minutes. After the



Geosynthetics February/March 2020

Table of Contents for the Digital Edition of Geosynthetics February/March 2020

Geosynthetics February/March 2020 - Cover1
Geosynthetics February/March 2020 - Cover2
Geosynthetics February/March 2020 - 1
Geosynthetics February/March 2020 - 2
Geosynthetics February/March 2020 - 3
Geosynthetics February/March 2020 - 4
Geosynthetics February/March 2020 - 5
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Geosynthetics February/March 2020 - Cover3
Geosynthetics February/March 2020 - Cover4
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